114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
/*
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* Copyright 2020 CM4all GmbH
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* All rights reserved.
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*
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* author: Max Kellermann <mk@cm4all.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "Queue.hxx"
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#include "CancellableOperation.hxx"
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#include "util/DeleteDisposer.hxx"
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#include <stdexcept>
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namespace Uring {
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Queue::Queue(unsigned entries, unsigned flags)
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:ring(entries, flags)
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{
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}
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Queue::~Queue() noexcept
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{
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operations.clear_and_dispose(DeleteDisposer{});
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}
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struct io_uring_sqe &
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Queue::RequireSubmitEntry()
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{
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auto *sqe = GetSubmitEntry();
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if (sqe == nullptr) {
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/* the submit queue is full; submit it to the kernel
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and try again */
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Submit();
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sqe = GetSubmitEntry();
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if (sqe == nullptr)
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throw std::runtime_error{"io_uring_get_sqe() failed"};
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}
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return *sqe;
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}
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void
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Queue::AddPending(struct io_uring_sqe &sqe,
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Operation &operation) noexcept
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{
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auto *c = new CancellableOperation(operation);
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operations.push_back(*c);
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io_uring_sqe_set_data(&sqe, c);
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}
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void
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Queue::DispatchOneCompletion(struct io_uring_cqe &cqe) noexcept
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{
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void *data = io_uring_cqe_get_data(&cqe);
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if (data != nullptr) {
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auto *c = (CancellableOperation *)data;
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c->OnUringCompletion(cqe.res);
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c->unlink();
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delete c;
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}
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ring.SeenCompletion(cqe);
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}
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bool
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Queue::DispatchOneCompletion()
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{
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auto *cqe = ring.PeekCompletion();
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if (cqe == nullptr)
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return false;
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DispatchOneCompletion(*cqe);
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return true;
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}
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bool
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Queue::WaitDispatchOneCompletion()
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{
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auto *cqe = ring.WaitCompletion();
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if (cqe == nullptr)
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return false;
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DispatchOneCompletion(*cqe);
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return true;
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}
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} // namespace Uring
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